Connected: An Internet Encyclopedia
RFC 793 - RECEIVE Call

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### RECEIVE Call

        CLOSED STATE (i.e., TCB does not exist)

          If the user does not have access to such a connection, return
          "error:  connection illegal for this process".

          Otherwise return "error:  connection does not exist".

        LISTEN STATE
        SYN-SENT STATE
        SYN-RECEIVED STATE

          Queue for processing after entering ESTABLISHED state.  If there
          is no room to queue this request, respond with "error:
          insufficient resources".

        ESTABLISHED STATE
        FIN-WAIT-1 STATE
        FIN-WAIT-2 STATE

          If insufficient incoming segments are queued to satisfy the
          request, queue the request.  If there is no queue space to
          remember the RECEIVE, respond with "error:  insufficient
          resources".

          Reassemble queued incoming segments into receive buffer and return
          to user.  Mark "push seen" (PUSH) if this is the case.

          If RCV.UP is in advance of the data currently being passed to the
          user notify the user of the presence of urgent data.

          When the TCP takes responsibility for delivering data to the user
          that fact must be communicated to the sender via an
          acknowledgment.  The formation of such an acknowledgment is
          described below in the discussion of processing an incoming
          segment.

        CLOSE-WAIT STATE

          Since the remote side has already sent FIN, RECEIVEs must be
          satisfied by text already on hand, but not yet delivered to the
          user.  If no text is awaiting delivery, the RECEIVE will get a
          "error:  connection closing" response.  Otherwise, any remaining
          text can be used to satisfy the RECEIVE.

        CLOSING STATE
        LAST-ACK STATE
        TIME-WAIT STATE

          Return "error:  connection closing".

Next: CLOSE Call

Connected: An Internet Encyclopedia
RFC 793 - RECEIVE Call